Announcify Chrome extension gives you audio alert count for unread items in Gmail.
Announcify is a Google chrome extension that adds audio alerts for announcing the count of your unread mails in Gmail inbox. This software is good for those who get caught up in work to be bothered by manual checking of new mail, ignore other visual notification, or do not all the time work on computer but near it.
It adds a manual button to Chrome toolbar too. If you come to your computer after a meeting or gap, you can click this manual button to force Announcify to inform you of number of unread mails.
Install Announcify extension @ Chrome extension